AMT/PTD/PBX/0058/4/6/EN Installation and Maintenance Manual - Aastra 5000
Page 216 01/2011 Description des sous-ensembles
4.13.2.2 Description of the signal processing daughter card:
The card provides the 32 kbit/s ADPCM encoding/decoding function that enables multiple
simultaneous calls on the same base station; it also provides echo damping and
cancellation functions.
ISDN interface cards (LD4, LD4N, LD4X) and EXT1-S/EXT1-S12 cards (fitted with four
ISDN ports), EXT1-S6 card (fitted with two ISDN ports) which by default have no ADPCM
encoding/decoding function, can be fitted with a card to increase the number of channels
per DECT base station: 4 channels per DECT base station when the card is available
instead of 2 channels per base station without any card.
The card is installed on connectors J5 and J6 of the ISDN interface cards (LD4, LD4N and
LD4X) as well as connectors J29 and J30 of EXT1-S, EXT1-S12 and EXT1-S6 cards.
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